Antenna structure



FIG. 1 is a perspective view of an antenna structure showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an enlarged view of a portion of the antenna structure shown in FIG. 3;

FIG. 5 is a top plan view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is a right side elevation view thereof. 

The ornamental design for an antenna structure, as shown and described. 